Monthly Archives: January, 2012

Calculating the PSK31 Audio Beacon NCO Constants

In my last post I described a method of creating PSK31 signals without explicit pulse shaping and used it to create a PSK31 audio beacon. The technique utilized two phase aligned NCOs (numerically controlled oscillators) from which it was necessary to produce a specific frequency shift rather than a specific frequency. Since this is not …

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Generating PSK31 Signals In The Frequency Domain

Update 1 June 2014: If you came here looking for information on PSK31 in an FPGA, try the post here. If you are involved with amateur radio you’ve probably heard of PSK31. For those who are not familiar with it, PSK31 is a digital mode designed by Peter Martinez (G3PLX) for live keyboard-to-keyboard contacts. It’s …

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